Symptoms:
It has been reported that due to variations between LDMOS devices, some radios may not meet the published specification of 4 watts after using the Code Plug Patch tool supplied under SRN1335. A new tool has been placed on the Dealer Secure Access Motorola Online Web Site that installs the code plug patch and if necessary allows transmit power adjustment.

Potential Problem Radios:
Model Numbers: AAH25Rxxxxxx and AAH34Rxxxxxx marked with a (#) sign prefix on the date code label ex: #0383

Serial Numbers: xxxTASxxxx through xxxTBCxxxx.

Cause:
Variances in LD MOS driver devices

Corrective Action:
To prevent failures of the LDMOS devices use the new "Code Plug Patch" (Requires RIB and Programming cable). The Code Plug Patch can be downloaded from the Dealer Secure Access Motorola Online Web Site. To install follow instructions below. Radios that have a defective LDMOS device, exhibited by No power out must be sent to the Radio Support Center for repair.

This SRN only applies to serial numbered radios listed above marked with a (#) prefix on the Date Code

$25.00 labor is authorized by warranty. Contact your local Motorola Authorized Service Representative to arrange for this modification.

Motorola is extending the original warranty period for six (6) additional months on all serial numbers in the above listed date range that exhibit this problem. All other repairs that do not qualify under the terms of this bulletin, must be processed under Standard Warranty Terms.

* For international shipments contact your Motorola Regional Service provider.

Click Here to Download Software "Patch"

Procedure:
1) Prepare the set up shown below:

2) Connect the appropriate programming cable (RKN4074A) to the side connector of the radio. This "Patch" will not work with the Ribless Programming cable. Connect the antenna port to a power meter using RF adaptor HHLN4134A.

3) Install "Patch" Program on Hard Drive or Floppy Disk. To run the program click on the executable file. The first window will appear. Select which Comm Port to use. Next select "Patch" to update radio. When complete, two beeps will be heard and radio will go into test mode. A second window will appear. This window will be used to adjust Transmit power if necessary.

4) To check and adjust transmit power select the "PTT" button on each frequency point. If necessary adjust the power to attain 4 watts by toggling the appropriate arrow for adjusting the corresponding slide bar. Radios should not be tuned in excess of 4.3 watts. When complete select "PTT" to dekey radio. If all the four points achieved the required power, go to step 6.

5) For any frequency points that cannot achieve the required 4 watts, adjust the V-limit value using the V-limit selection boxes. Follow this process - Select "Vlima" for corresponding frequency point. Two beeps will be heard from radio. Toggle "PTT" to observe transmit power. If 4 watts are not achieved dekey radio and follow same process for "Vlimb" and "Vlimc". Selections must be made in sequence to achieve the best results.

6) After you have tuned all the frequency points, select the "Program" button. Two beeps will be heard from the radio. All the tuned power settings are now programmed into the radio and you are ready to proceed with the next radio.